[Rudolf]

The author of the German loudspeaker simulation program "Boxsim" has translated the program into English http://www.visaton.de/vb/showpost.php?p=310418&postcount=1 . This does not make the program easier to use, but at least you will understand what it is all about.
To install Boxsim, you will first need to download and install the German program which incorporates the Visaton driver data and Xover component values. Download it at http://www.boxsim.de/download/Boxsim111b.zip and install it.

After that you install the English version http://www.boxsim.de/download/Boxsim113_en.zip into the same directory.

If you want to simulate open baffles with Boxsim, you have to configure the "Enclosure & Impedance" part of the "Drivers & Enclosures" dialog in this way:



I will try to give a short introduction into Boxsim early in the new year.

Rudolf

[scorpion]

Rudolf,

Thanks ! Yes, we will need the introduction, since this programme doesn't seem to be easily intuitively understood.
But as you have experience with a good range of simulation software what are Boxsim's strong features compared to others ?

/Erling

[David Weil]

The strong features are
- it is easy to learn and use.
- it gives astonishingly exact predictions.
- it is free.

Weaknesses
- introducing new driver data is a pain in the xxxx.
- active crossover modelling is restricted to one 6 dB and two 12 dB HP and LP filters per way. No notch or other filters can be simulated.
- no simulation of horns, TLs and so on is possible, OB only per workaround.

[moij]

How are things with Boxim english version for today?
On Boxim site no new version still.

What actually means this enclosure and impedance settings to simulate open baffle?

[Rudolf]

How are things with Boxim english version for today?

I was told that there will be a next english version "soon". Don't ask me what date they were envisaging as "soon".

What actually means this enclosure and impedance settings to simulate open baffle?

Remember that the open baffle option in Boxsim is a workaround. It is using the vent of a BR enclosure to simulate the rear radiation. To achieve that you want to minimise the enclosure volume and to make the vent hole "dissappear". That's what the settings are trying to do.

[moij]

Is this workaround only for plain baffle, U or H frames are not possible to simulate with Boxsim?

[Rudolf]

Is this workaround only for plain baffle, U or H frames are not possible to simulate with Boxsim?

Yes, yes and yes.

[Rudolf]

There is a new (permanent) english version 1.2 of Boxsim available at http://www.boxsim.de/download/Boxsim120en.zip.

[rick57]

If several packages have similar accuracy, what do you think is the best on other criteria?

[Rudolf]

If several packages have similar accuracy, what do you think is the best on other criteria?

Hello Rick,

I am not sure, what kind of "packages" you are talking about. Program packages? Certainly they don't have similar accuracy. EDGE doesn't know about driver TSP, but has a very easy user interface and versatility in baffle shaping. BASTA is a sort of grown-up EDGE including TSP and a lot of other features. MJKs OB worksheet are strong in H- and U frames and room interaction (which is really missing from everybody else). Boxsim includes real driver measurements, but will only do rectangular baffles - albeit as many of different sizes with as many drivers as you want to combine at the same time.

In general I'm not sure if "accuracy" is at all a useful term for todays dipole simulation "toys". The edge diffraction models in use become highly inaccurate when getting off axis, and nobody is accounting for the influence of the differing rear output of the drivers. You really would need FEM analysis to get that right.

I see all those programs only as starting points, from where measurements have to get you to your target response. Their main value is their use as learning tools - showing us how changes in one aspects lead to certain results in another aspect.

Rudolf

BTW: How is your Porsche doing? 

[rick57]

Hi Rudolf

Thanks, that's the sort of snapshots i was after

My "Porsche" tweeter (Neo3 * 2) and mid baffles (Neo10) are soon to be cut.
Will not look like a speaker at all - more like a musical instrument, a Tibetan lyre   
(I designed them in Excel, and will fine tune them with a pantograph to A3, and hand work)

Also waiting on 93 dB Lambda 15 LOs from Stryke for the bass . .   

Cheers

Rick

[rick57]

For measurements (my system will be all active with miniDSP) do you prefer ARTA or HolmIMPULSE?

Cheers

[Rudolf]

For measurements (my system will be all active with miniDSP) do you prefer ARTA or HolmIMPULSE?

Hi Rick,

I have looked into HolmImpulse only briefly, but use ARTA all the time. Although I had to pay for ARTA to make it useful. Reasons? ARTA renders much prettier and colorful diagrams. I like that. I find the ARTA GUI to be more intuitive, but both programs don`t really excel in that regard. Since I have started to use the ARTA polar plot function, I believe that my dipole developments have become the best documented worldwide  . Just look at my http://www.diy-hifi-forum.eu/forum/showthread.php?t=2870 "Swinger(s) Club". It is a pity if you don`t understand German. I have tried to keep the descriptions really as naughty as the thread title. When starting with it I wasn't prepared to discover how sexy loudspeaker development can be.

I'm eager to see how a Tibetan lyre loudspeaker looks like.

Cheers
Rudolf

[rick57]

I thought there'd be the option to upload a  'Paint' file . . 

[rick57]

Black is the rectangular Neo speaker drivers

The idea is to not look rectangular; but like a slightly old fashioned musical instrument (lyre) or a 2D image (inspired by the 1930s' RKO Pictures logo)

[rick57]

(It will sit on top of a conventional U frame 15" Lambda woofer, so that the tweeters are at ear height).